Spark plug



July 17, 1923- W. A. HEIDE SPARK PLUG Filed July 1920 vvilliam NN NN Patented July 17, 1923. i

WILZIAIC A. BRIEF), @IF DETRQIT, IIIGHEGAN.

SPARK PIUG.

Application filed an a, mo. Serial No. 893,800.

To all whom it may concern:

Be it known that I, WILLIAM A. li a citizen of the United States, residing Detroit, in the county of Wayne and State of Michi an, have invented a new and useful Spark lug, of which the following is a specification.

This invention relates to spark plugs, one of its objects being to provide a device of this character the electrode of which is adapted to he placed in the path of the incoming gas and and close to the gas inlet port where the velocity of the gas is greatest and will exert a blowing or cutting action through the spark gap, therelcy to prevent the carbon from accumulating.

A further object is to provide a s1 plug so constructed that the end of electrode can be readily adjusted the reed distance from the terminal or contact ccoperating therewith even though the same is not visible.

A still further object is to provide an electrode cooperating with the engine hloclr in such a manner that the spark will jump from the electrode to the wall of the block close to the gas inlet, as before stated.

With the foregoing and other objects in view, which will appear as the description proceeds, the invention resides in the cornloination and arrangement of parts and in the details otconstruction hereinafter described and claimed, it being understood that, within the scope of what is claimed, changes in the precise embodiment of the invention shown can be made without departin from the spirit of the invention.

In t e accompanying drawings the prei'erred forms oi? the invention have been shown.

ln said drawings Figure l'is a section through a spark plug such as constitutes the present invention.

Figure Q is a similar view showing a sh htly modified form of spark plug.

eterring to the figures by characters of reference 1 designates a portion of the block of an engine having a gas intake port 2 and adjacent this port is arranged a screw plug 3 constituting one of the terminals of the spark gap. The other terminal consists of the electrode 4 of the sparlz plug constituting the present invention. This spark lug includes a shell 5 adapted to he screwed into the block it and rovided with an interior shoulder 6. upported on this shoulder is annular enlargement 7 formed upon a core 8 of porcelain or other insulating material, core projecting close to the inner end of the shell 5 where it is recessed, as shown 9 while the other end of the porcelain core is extended outwardl beyond shell and is surrounded by a sllaeve nut 10 which is screwed into the shell 5 and serves to hold the enlargement 7 upon the shoulder Obviously any suitalole packing material indicated generally at 11 can he lnterposed letween the enlarged portion '3 and the shoulder (5 and nut 10. l Mounted on the upper end portion of the insulating core 8 is a sleeve 12 of fiber or other suitable insulating materiel, that portron of the sleeve surrounding the porcelain core peing split, as indicated at 13 and surrounded a clarnp which, when tightened by means of bolt 15, will cause the insula g sleeve 12 to hind upon the core 8. caloly secured within the sleeve 12 is a oushing lo interiorly screw threaded, this pushing being engaged by a screw plug it aving a recess extending thereinto trom its inner end as shown at 18. A look nut 19 is mounted on the screw plug. llhe electrode extends through the insulating core 8 and through the plug 17 and is engaged by nuts 20 located in the recess 18 and which hind together so as to be locked against rotation on the electrode. This electrode is slidalole to a limited extent within the screwplug 17, its sliding movement being limited by a nut 21 which also cooperates with another nut 22 on the electrode for securing a terminal wire to the electrode.

In applying this spark plug to an engine the shell 5 is screwed into the block l. The lock nut 19 is loosened and the plug l? is screwed into the bushing 16 until the end of the electrode l comes into contact with the terminal 3. The nut 21 is then unscrewed so as to move away from the plug 17 a dis tance equal to the spark gap to be provided between the electrode 4- and the terminal 3. this accurate adjustment of the nut 21 has been effected the electrode 4 is held pressed against the terminal 3 while the plug 17 is unscrewed from the hushing 16 until it comes against the nut 21. The lock nut 19 is then screwed down against the bushing 16 so as to hold the plug 17 against further movement after which the nut 21 is screwed onto the electrode so as to draw said electrode longitudinally until the nuts 20 come against the end of the plug 17. This obviously will shift the electrode a distance exactly equal to the desired spark gap. A wire teqninal can then be placed on the electrode between th nuts 21 and 22 and clam d 'by adjusting the nut 22 downwa ly therea inst.

Various modifications of the structure described can of course be made, as will be obvious. For example, instead of providing the sleeve 12 with a clamp for holding it in place, a sleeve 23 can be extended between the insulati core 8 and the sleeve nut 24, one end of t e sleeve 23 being out turned so as to be held between'the inner end of the sleeve nut-24 and the enlargement on the insulating core. This has been shown clearly in Figure 2.

What is claimed is:

1. In a spark plug the combination with a shell and an insulating core, of an electrode, and means'for adjusting the electrode longitudinally relative to the core, said means including a threaded member through which the electrode extends, means upon the electrode and within said member for bolding the electrode against movement in one direction relative to the member, means upon the electrode for engaging the outer portion of sa-id member for indicating the 80 size ofa spark gap to be produced, said member being shiftable against the ga indicating means to support the electro e at the proper point to produce the desired gap, means for locking said member in shifted position relative to the insulating core, and means for securing the electrode to the member and against relative movement after it has been adjusted to a spark gap of the desired size.

2. A spark plug including a shell, an in sulating core, a bushing connected to said core, a screw plug engaging the bushing, an electrode slidably mounted with the plug and core, means upon th electrode and within the plug for limiting the movement of the electrode in one direction relative to the plug, a combined gauge and lock nut upon the electrode for engaging the outer surface of the plug, and a lock nut upon the plug for engaging the bushing. v

In testimony that I claim the foregoing as my own, I. have hereto aflixed my signature in the presence of two witnesses.

7 WILLIAM A. HEIDE. Witnesses DERRICK S. Bnown, P. A. Lorxascn. 

